hypotrichosis

absence of hair at birth. Occurs as an inherited trait in the hairless breeds of dogs and cats, Mexican hairless, Chinese crested and Sphinx, and sporadically in other breeds; has also been reported as an inherited condition in several breeds of cattle.

partial or complete absence of haircoat at birth. Some may have had a partial haircoat and lost it subsequently. Tactile hairs and eyelashes are present. There may be other defects including absence of thyroid tissue. The affected animals may or may not be viable. Occurs in all species but most common in cattle and in some breeds of dogs. See also inherited symmetrical alopecia.

lethal hypotrichosis

occurs in Holstein-Friesian cattle; affected calves die within hours.

tardive hypotrichosis

reported as a sex-linked trait in Holstein-Friesian cattle; affected females are normal until a few months of age when a progressive loss of hair occurs. They are otherwise normal.

viable hypotrichosis

an autosomal recessive trait in Guernsey, Jersey and Holstein-Friesian cattle. Affected calves are nearly hairless at birth, but later some hair grows on the thorax and abdomen.

streaked hairlessness, hypotrichosis

irregular, narrow streaks of hairlessness, occurring only in females is recorded in Holstein cattle.

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